The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure six units of the coupler antenna (NSN 7R-5985-015855349-P8, REF NR 822-1706-002). This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that all proposals include detailed documentation demonstrating compliance with the qualification requirements set by the Government engineering activity. The approved sources retain essential data rights and manufacturing knowledge, making it imperative for any new sources to undergo a qualification process prior to contract award. Interested parties must submit their proposals, including the necessary source approval documentation, within 45 days of this presolicitation notice, and can direct inquiries to Danielle Diciacco at (215) 697-5970 or via email at DANIELLE.DICIACCO.CIV@US.NAVY.MIL.